Assessment of potential concrete and mortar rheometry artifacts using magnetic resonance imaging

Hafid, H.; Ovarlez, Guillaume; Toussaint, Fabrice; Jézequel, Pierre-Henri; Roussel, Nicolas

doi:10.1016/j.cemconres.2015.01.009

Cited by 31 publications

(9 citation statements)

References 26 publications

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“…However, these studies confirm the Bingham behavior of these fresh concretes (Wu, Liu 2015;Wallevik et al 2015;Yahia, Tanimura 2015;Vance et al 2015;Faleschini et al 2014;Choi 2014;Kong et al Fig. 1.…”

Section: Introductionsupporting

confidence: 52%

“…At the beginning of the test, the maximum speed is applied pre-shear phase to eliminate the influence of thixotropy (Hafid et al 2015;Hu et al 1996). The tested profiles are presented in Figure 3.…”

Section: Choice Of Velocity Profilementioning

confidence: 99%

“…With the development of new concretes such as selfcompacting concrete (SCC), high performance concrete (HPC), and environmental friendly concretes, the control of rheological parameters (yield stress, plastic viscosity) in order to optimize the implementation of these concretes becomes crucial (Wallevik 2006;Wallevik et al 2015). It is therefore necessary to develop new methods of characterization of the rheological parameters not only in the laboratory but also on construction site.…”

Section: Introductionmentioning

confidence: 99%

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Design of portable rheometer with new vane geometry to estimate concrete rheological parameters

Soualhi

Kadri

Ngo

et al. 2016

Journal of Civil Engineering and Management

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This paper presents the development of a portable vane rheometer to estimate concrete plastic viscosity and yield stress. The apparatus can be used not only in laboratory but also on construction site. In this study, new blade geometry was proposed to minimize the effect of segregation of concrete during testing, and also to expand the wide range of concrete workability with a slump of approximately from 7 cm to fluid concrete, and concrete with high plastic viscosity such as concrete with mineral additions. The used blade (U shaped and reversed) allows reducing the vibration of the apparatus, and obtaining more stable measurements. The obtained results permit validating the rheometer test procedure and confirmed that the results are reliable, with a low coefficient of variation of 9% for repetitive test and of 5.8% for reproductive tests.

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Section: Introductionsupporting

confidence: 52%

Section: Choice Of Velocity Profilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of portable rheometer with new vane geometry to estimate concrete rheological parameters

Soualhi

Kadri

Ngo

et al. 2016

Journal of Civil Engineering and Management

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“…As a consequence, upon constant rotation of the inner cylinder, an increase of particle's concentration near the static outer wall is expected. Shear‐induced migration in wide‐gap CCs has been widely studied for non‐colloidal particles suspended in Newtonian, viscoelastic and yield stress fluids, and in neutrally buoyant suspensions . However, the migration of colloidal particles has been much less described, being restricted to rather dilute suspensions in the case of oil/water emulsions …”

Section: Resultsmentioning

confidence: 99%

Selective oil‐phase rheo‐MRI velocity profiles to monitor heterogeneous flow behavior of oil/water food emulsions

Serial

Nikolaeva

Vergeldt

et al. 2019

Magnetic Reson in Chemistry

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“…In this study, spherical glass beads were used to represent the sand, and the rheometer's gap size was typically of order 10 times the particle size. Additionally, slippage and shear-induced migration of particles during measurements are also of concern in conventional rheometers [7]. Suspended particles, no matter how small, experience radial sedimentation or migration away from the rotating surface of the rheometer, even at low shear rates.…”

Section: Introductionmentioning

confidence: 99%

Rheological measurement of suspensions without slippage: experimental and model

Olivas¹,

Helsel²,

Martys³

et al. 2016

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Rheological measurements of suspensions are often performed using a rotational rheometer.In this type of rheometer, the tested fluid is sheared between two surfaces, one of which is rotating to generate a laminar flow of the fluid between the surfaces (i.e., a Couette flow). Manufacturers of commercially available rheometers generally recommend the use of a standard oil of known viscosity to verify that the rheometer is operating correctly. However, in the case of concrete rheometers, this approach would require large volumes of oil and was deemed not economically During the certification of SRM 2493, it was found that differences in rheometer geometry affect the accuracy of the rheological measurements. In order to gain fundamental insight about the impact that different rheometer geometries have on measurements of suspensions, a comprehensive analysis was conducted on three different rheometer families. The analysis included both experimental testing and computer simulation. The comparison between the model and rheological results showed that the increased viscosity due to the addition of the 1 mm beads to SRM 2492 was significantly higher in the Couette model than in the experimental data. It was also determined that some geometries, such as a double spiral, resulted in a higher viscosity than a simple serrated cylinder or vane. This finding led to the inference that slippage should also be considered. Ultimately, this report highlights that industrial rheometers experience slippage issues caused by their choice of geometry and their internal boundary conditions (free surfaces), and discusses the most accurate alternative available for calibrating rheometers.i ______________________________________________________________________________________________________ This publication is available free of charge from: https://doi

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Assessment of potential concrete and mortar rheometry artifacts using magnetic resonance imaging

Cited by 31 publications

References 26 publications

Design of portable rheometer with new vane geometry to estimate concrete rheological parameters

Design of portable rheometer with new vane geometry to estimate concrete rheological parameters

Selective oil‐phase rheo‐MRI velocity profiles to monitor heterogeneous flow behavior of oil/water food emulsions

Rheological measurement of suspensions without slippage: experimental and model

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